Toshiba e-STUDIO4500c - Page 396

SPECIAL PROCEDURES April, 2007
4-18
General Displayed
Code
Item Major Cause Action
Normal 10 Successful --- ---
15 VdHome Error
1
V0 (SP3571) above –700V, or
VdHome (SP3572) above –700V.
• The window of the potential
sensor probe fouled with toner
• Potential sensor damaged
• Do SP2260 001 to check the function of the potential sensor.
• Do SP2261 to check the Vd, Voffset readings. For more, see
Section 6. Development has recovered if the Vd is -700V and offset
is -10V.
• Remove the PCU. Use a blower brush to clean the window of the
potential sensor probe, then check the sensor again with SP2601.
• If normal operation cannot be restored, replace the potential sensor
probe.
16 VdHome Error
2
V0 (SP3571) below –700V, or
VdHome (SP3772) below –500V.
• Potential sensor relay board
damaged
• Drum abnormal
• Charge roller damaged
• Drum motor not operating
• Do SP2260 001 to check the function of the potential sensor.
• Do SP2261 to check the Vd reading. For more, see Section 6.11.
Development has recovered if the Vd is -700V.
• Remove the malfunctioning PCU with an functioning PCU, turn the
machine OFF then ON, then do the potential sensor check again.
• If the replaced PCU does not function normally, then the problem is
on the machine side, or the potential sensor relay board is
malfunctioning.
• If the replaced PCU functions normally, then there may be a
problem with the drum or the charge unit. Replace the PCU.
Potential
Sensors
17 VdHome
Calculation
Error
VdHome could not be calculated.
This is a software calculation error
(not a hardware problem).
• Switch the machine OFF/ON then execute SP3820 001.
21 ID Sensor Vsg
Adjust Error
Vsg_reg (SP3121) is out of range
(not within 4.0±0.2V).
• ID sensor fouled with dust,
toner
• ITB undulating or out of
position
• Remove the ITB unit.
• Make sure the belt is mounted correctly.
• Clean the windows of the ID sensors with alcohol and a clean cloth.
• Be sure to wipe the sensor apertures with a wet cloth. A dry cloth
may generate static which can attract dust.
ID Sensors
22 ID Sensor LED
Current Error
LED PWM (SP3131) greater than
3000.
• ID sensor fouled with dust,
toner
• ID sensor deteriorated
• Remove the ITB unit and check the ID sensors.
• Clean the windows of the ID sensors with alcohol and a clean cloth.
• Be sure to wipe the sensor apertures with a wet cloth. A dry cloth
may generate static which can attract dust.
• If the apertures are clean, then the LED of an ID sensor may have
deteriorated. Replace the ID sensor plate.